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Document {n}? regexp pattern is optional and not non-greedy [ci skip]

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While not consistent with {n,}?, {,m}?, and {n,m}?, it is arguably
more useful, as otherwise the ? would have no effect.

Fixes [Bug #15583]
This commit is contained in:
Jeremy Evans 2019-08-28 11:40:56 -07:00
parent e82719c651
commit cd0e208963
1 changed files with 5 additions and 2 deletions
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7
doc/regexp.rdoc
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@ -189,8 +189,11 @@ At least one uppercase character ('H'), at least one lowercase character
Repetition is <i>greedy</i> by default: as many occurrences as possible
are matched while still allowing the overall match to succeed. By
contrast, <i>lazy</i> matching makes the minimal amount of matches
necessary for overall success. A greedy metacharacter can be made lazy by
following it with <tt>?</tt>.
necessary for overall success. Most greedy metacharacters can be made lazy
by following them with <tt>?</tt>. For the <tt>{n}</tt> pattern, because
it specifies an exact number of characters to match and not a variable
number of characters, the <tt>?</tt> metacharacter instead makes the
repeated pattern optional.
Both patterns below match the string. The first uses a greedy quantifier so
'.+' matches '<a><b>'; the second uses a lazy quantifier so '.+?' matches